Saw-mill



(No Model.)

. 2 Sheets-Sheet 1. J. M. STORY.

SAW MILL,

Patented Mai. 18; 1884,

I N f.

N. Puma n-uwmm mm. wmmgmmc.

Nrrn TATES J QSEPPLM. STORY, OF SPRING CITY, TENNESSEE.

SAW-MILL.

SPECIFICATION forming part of Letters Patent No. 295,303, dated March18, 1834.

Application filed March 26, 1883. Renewed January 24, 1884. (No model.)

To (:LZZ 2071,0711, it. may concern:

Be it known that I, Josnrrr M. STORY, a citizen of the United States,residing at Spring City, Tennessee, have invented new and useful 5Improvements in Sawing Lumber, of which the following is aspecification.

My invention relates to circular saw mills employed in cutting logs intoboards, its object being to improve their efficiency and economy 1 ofoperation; and to this end it: consists in a novel construction of suchmills, embodying also anovel principle of operation conducing toefficiency.

The essential principle of myinvention consists in giving to the log avertical and horizontal movement in relation to the saw by suit ablemechanism controlling the carriage.

The remaining features of myinvention con sist of the construction andarrangement of QC mechanism employed in carrying outthe above statedprinciple, all as more fully set forth herein.

A convenient form of mechanism embodying my invention is illustrated in'the accompany 5 iug drawings, in which Figure 1 is an end view of thesaw-mill, showing the relative positions of the various parts. Fig. 2 isa side elevation sectioned vertically through the carriage; Fig. 3, adetached View of aportion of the carriage and one of its yokes anddriving-pinion, showing details of construction by apart section of theyoke longitudinally; Fig. 4, a cross-section of one of the yokes,showing its construction in relation to 5 the bearing-rollers and driving-pinion; and Fig. 5, a partial face view of the saw, showing thesegmental plates bolted to the hub.

Referring to the drawings, inwhich the parts described are indicated byvletters of referao'encc, A designates the floor of the mill; B, the

tical and longitudinal motion in relation to the saw. A preferableconstruction is to secure upon the bottom of the carriage foursupporting guide-yokes, E, arranged in pairs at each end of thecarriage. These yokes are curved, as shown in Fig. 1, and extenddownward over two parallel horizontal shafts, F F, rotating in bearingsbeneath the floor A. By means of the rotation of these shafts motion isgiven to the carriage through spur-pinions a at each guide-yoke meshingin a line of cog-teeth, or rack, 1), formed centrally in the lowerinterior face of the yoke. Each pinion a is flanked by two flangedfriction-rollers, d (1, running loosely upon the shaft, and upon theserollers the yoke bears by means of bearing-rails e, flanking the rack bas part of the yoke. The construction of the yoke and of its interiorfaces will be readily understood by reference to Figs. 3 and 4.

The shafts F F are driven by worm-gear G, arranged in suitablebearingsbeneath the floor, engaging spur-pinions G upon the shafts, theworm-shaft G being driven by reversible friction-gear in any convenientmanner. A prefer able construction of the'frictiongear is a pivotedframe, H, carrying two parallel shafts, 7z-,pro vided withfrictionwheels f, driven in opposite directions by belting from acounter-shaft, h. The pivoted frame H is mounted in a support ing-frame,l, and so arranged that its frictionpulleys f may, by the oscillation ofthe frame H, be thrown alternately into driving contact with a friction-'nilley, G, upon the worm-shaft G, which oscillation is effected byahand-la ver, K, and suitable connections under control of theattendant.

The operation is as follows: The parts being in the position shown inFigs. 1 and 2 and the log (indicated in Fig. 2 by dotted lines) beingsecured to the headblocks upon the carriage, forward motion is given tothe shafts F F by means of the friction and worm gear. The first effectof the movement is to carry the log downward upon the saw indicated inFig. 2 by dotted lines) and to open the kerf at the end of thelog, andthen, by reason of the curved contour of the guide-yokes E, to carry thelog forward across the upper are of the saw. A reversal of the movementrestores the carriage to its original. position, ready for the next out.

The carriage is arranged to have both aver- IOC Beneath the platform D,adj acent-to-the saw, a system'of rollers, L, is arranged, with asuitable spreader, Z, to open the kerf as the cant goes forward andguide the board into posi- 5 tion upon the rollers.

WVhile I have shown-the saw arranged below; the carriage and the latteroperated downward upon it, it will be obvious that a reversal of theprocess may be efi'ected by arranging the saw above the carriage andfeeding the work upward to the saw. The advantages of this constructionare many and obvious. I The linear travel of the carriage is reduced,the'grav-l ity of the carriage and log assists the work,

.andby the increased rotative speed of thesawteeth. a much smootherboard is obtained. Moreoveiythe' construction of the saw and its high.circumferential speed enables the use of i much thinner sheets of metalfor the-segments,

than are ordinarily employed, and the loss of material in. the kerf ismaterially reduced, and .any injury to the saw may be repaired iIJGXpensively by replacing one or more segments. r If found necessary, anadditional supportingshaft, F, may be employed to preserve a properbalanceof the carriage, orthe two described. may be placed in suchposition as to-"better attain this object, or the yokesentirelydispensed with and: the carriage operated upon' suitably- 3o inclinedguideways by chain gear or other mechanism. x v

I: claim as my invention and desire to secure by Letters Patent i y Y-1. The combination, substantially as before 3 5 set forth, of thelog-carriage and mechanism, substantially such as described,for-propelling the same, whereby in feeding the log'to the saw the.simple horizontal movement of said I carriage is" preceded by acompound vertical and horizontal movement thereof.

2. In a circular saw mill, a log-carriage provided with curvedsupporting-yokes, adapted to be propelled and guided upon fixed shaftsto givethc log both a vertical and horizontal movement in relation tothe saw, substantially as set forth. '3; In combination with thecarriage B, the curvedsupporting-yokes E,having the interior face at oneor both sides formed as'bearingrails, and thedepressed surface betweenthe rails formed asa-rack, and the supportingshafts F F, provided withspur-pinions and friction-rollers, substantially as specified.

4. In combination with'a" log-carriage-pro- 'vided with guide-yokes andshafts, upon which *thesame are guided and driven, the ieversf ble wormand friction gear, substantiallysueli 'as described, for impartingreversible motion to the carriage as set forth. -5. The construction andarrangement, in a saw-mill, of a circular saw journaled beneath thefloor, and operating upward through'the same, a carriage having both avertical and horizontal movement in relation to the saw,

and mechanism, such substantially as described, for supporting, guiding,and operating the carriagennder control of the attendan't, substantiallyas set forth. I

' In testimony whereof I have hereunto set my hand in the presence oftwo subscribing wit nesses. y

. J. M. STORY.

Witnesses:

L. M. Hosm, LOUIS F. SCIIUERMAN.

